Belt loop sewing machine



Feb. 12, 1952 J. GALKlN 2,585,306

BELT LOOP SEWING MACHINE 7 Filed May 31, 1947 '7 Sheets-Sheet l JOSEPH GALKIN [NVEN TOR.

ATTORNEY Feb. 12, 1952 J. GALKlN 2,585,306

BELT LOOP SEWING MACHINE '7 Sheets-Sheet 2 Filed May 51, 1947 "I l H JOSEPH GALKIN INVENTOR.

ATTORNEY J. GALKIN BELT LOOP SEWING MACHINE Feb. 12, 1952 7 SheetsSheet 3 Filed May 31, 1947 JOSEPH GALKIN INVENTOR ATTORNEY BELT LOOP SEWING MACHINE Filed May 31, 1947 '7 Sheets-Sheet 4 .l a W111i W I 0 Q} i "MI" W- 9 a l I 1| 929$ 0 R a;

JOSEPH GALKIN INVENTOR. SI BYWM/ I ATTORNEY Feb. 12, 1952 J. GALKIN 2,585,306

BELT LOOP SEWING MACHINE Filed May 51, 1947 7 Sheets-Sheet 5 JOSEPH GALKIN IN VEN TOR.

' ATTORNEY Feb. 12, 1952 J. GALKIN 2,585,306

BELT LOOP SEWING MACHINE Filed May 31, 1947 7 Sheets-Sheet 6 FIG] JOSEPH GALKIN INVENTOR.

ATTORNEY '7 Sheets-Sheet 7 Filed May 31, 1947 FIGJO JOSEPH GALKIN INVENTOR.

I BY W Y 1 ATTORNEY Patented Feb. 12, 1952 OFFICE BELT LOOP SEWING MACHINE Joseph .Galkin, New York; N; Y.

Application, May 31, 1947, Serial No. 751,573

'7 Claims.

This invention relates to improvements in sewing machines whereby belt loops 'are automatically produced in 'a "single operation by mechanism which cuts cloth into 's'tripsand folds the strips into belt loop form having inturned edge portions and feeds the belt loops 'with'upper feed dogs placed in a single row.

In my prior Patent No. 2,262,547 I have disclosed mechanism for producting'belt loops having edge portions in abutting relation and stitched by two spaced needles which caused two threads to pass through and be visible on the'upper and lower surfaces of the belt loops.

I have found that it is a detriment to high productive capacity 'to'mak-e a butt edge junction at the trimmed edges because of thevery fine workmanship required to produce 'a full closure at the butt edge. I have found that by overlapping the belt loop fabric that the blindstitched belt loop is easily made. 7 An object of this invention is to provide "mechanism for producing belt loops in which the stitching is not visible on the normally exposed surface of the fabric .and which is produced in single operation.

With the above and other objects in View, the invention will be hereinafter more particularly described, and the combinationand arrangement of parts will be shown in the accompanying drawings and pointed out in the claims which form v part of this specification.

Reference will now be had to the drawings,

' wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure 1 is a top plan view of a blindstitch sewing machine having my invention applied thereto, the three top feed-dogs'being removed to show the strip cutting and belt loop folding mechanism.

Figure 2 is a fragmentary .top plan, view of the Figure 6 is a top plan view of the presser foot.

Figure 7 is a top plan 'view of a work clamp which cooperates with the bottom of the pressei. foot.

Figure 8 is, a side elevation showing three top feed dogs mounted in co'acting relation.

.as is wellknown in the art.

2 Figure 9 is a perspective'view of the folder; Figure 10 is a perspective view of a finished belt'loop'on an enlarged scale.

In the illustrated embodiment of the invention,

the numeral Ill indicates a hollow frame of a sewing machine embodying my invention and which comprises a base ll having a standard 12 extending upwardly along the front end of thebase H, a post is which extends upwardly from the rear right hand corner of the base, a horizontalarm M which extends laterally from the upperend of the post l3 and overhangs the left hand edge .of

the base H and a horizontal arm l5 which extends forwardly from the overhanging end of thearm IA.

The forward end of the arm I5 terminates at a point considerably in the rear of the standard 12. 'Thehorizontal arms I4 and I5 and the supporting post l3 are hollow.

Journaled in the horizontal arm I4 is arotaiy main shaft I! having a combined driving pulley and hand wheel I 8 fixed to its right hand end portion. Journaled in the forwardly extending horizontal arm I5 is anoscillatory needle shaft IS.

The needle shaft I9 isoscillated from the main shaft IT by an eccentric on the main shaft which drives a vibratory connection on the needle shaft,

As shown in Figure 4 the shaft 19- extends forwardly'beyond the freeend of the arm l5.. Fixed to the projecting end of the shaft [9 isa needle arm 20 to which a curved needle 2! is attached by a clamp 22.

Cooperating with the needle 2! to form va'line of single thread blind stitches, is a looper 2.3 'which is fixed to a looper bar 24 pivotally supported as at 25 on thearm i5. The looper bar 24 is actuated from the mainshaft i! by a connection comprising a universal joint on the looper bar and a. crank pin angularly positioned at one end of the main shaft (not shown).

A stationary'presser foot 35 is disposed below the needle 2| and also below the looper 23. The

presser 'foot is detachahly connected to. the arm 25 through the medium of a fork M which is formed on the rear end of th presser foot and which issecured by screws 32 to the end face of thearm 1'5. 7

J ournaled on a horizontal pivot shaft 35 at. the upper end of the standard I 2 is a work support [3.6 which is normally disposed in a substantially horizontal plane. The support 36 has a straight rear edge 3'! which is in rear of the path of needle oscillation. The support 36 is formed at its left rear .corner with. a reduced extension .38 which projects towards and below the presser foot 30.

V the oscillatory finger tacting relation with the frame Ill and main tains the upper surface of the pivoted work support 36 in a horizontal plane. To maintain this horizontal position of the work support 36 there is provided a rod 42 fixed in the flange 39 and urged toward the rear of the frame I!) by a coil spring (not shown).

This spring tends to swing the work support 36 upwardly relative to the presser foot 30. The

screw 40 limits the upward swinging movement of the work support 36 relative to the presser foot.

A foot treadle has a horizontal extension 46 rotatably mounted in bearings 41. An arm 48 is fixed to the extension 46 by a screw 49 and carries a link 50 which is in engagement at its upper end with the free end of the pivotally mounted work support 36.

When the operator presses his foot against the treadle 45, the arm 48 swings the work support 36 about the pivot 35.

The sewing machine comprises means for projecting a ridge of fabric upwardly through the stationary presser foot 30 into needle penetrating position during each cycle of operation.

The ridge of fabric is projected by an oscillatory finger 5| fixed to a rock shaft 52 which is suitably journaled in bearings in the work support 36. The rock shaft 52 is oscillated from the main shaft I! through the medium of a driving eccentric 53 fixed to the main shaft IT. A strap link 54 has one end fitting around the eccentric 53 and the other end pivotally connected to the lower end of an arm 55 fixed to the rock shaft 52.

The needle 2| oscillates in a fixed path of travel in a needle groove above an opening 6| formed in the presser foot 30. The oscillatory finger 5| projects into the opening 6| of the presser foot when forming and positioning the ridge of fabric upwardly into the path of the needle.

As best shown in Figure 6, the presser foot 30 comprises a presser-finger 62 pivotally mounted on a pin 63 and pressed down by the free end portion 64 of a coil spring 65 which is suitably fixed on a screw 66 in the presser foot.

The presser-finger 62 is mounted on the presser foot 30 at the forward end thereof and at the right hand side of the opening 6| and includes a laterally extending portion 61 which overhangs The portion 61 is disposed in front of the path of the needle 2|.

Figure 7 is a top plan view of a work clamp or work support finger 68 which cooperates with the bottom of the presser foot 30 to clamp the ridge of fabric therebetween. The ridge projects upwardly through a slot 69 in the work clamp f68 tand through the opening 6| in the presser The work clamp 68 is pivotally mounted on a screw 10 and moves up and down and is springpressed towards the presser-foot 30 by a spring 56 connected to a lever 51 pivotally mounted on the screw 58. The lever 51 is pivotally connected by.

gated key 80.

the fabric against the thrust of the needle. The work clamp 68 has two upwardly extending side bars 1| 12 forming a passageway therebetween for the folded belt loops. The above mechanism provides a resilient mounting for the work clamp 68. The usual resilient mounting of the work clamp 68 is shown in Patent No. 2,157,032.

The invention is particularly directed to a combination of mechanisms operating upon scraps of cloth for automatically forming in a single operation belt loops having flat and superposed edge portions. The invention comprises a trimming mechanism 13 for trimming two fabric edges so as to prepare a strip of predetermined width, and a folder 14 for folding the strip into belt loop form and directing the same to the stitching mechanism for stitching the belt loop.

The invention also provides a front top feeddog 15 having a forward portion of rectangular form for feeding the strip through the trimming mechanism, and having an integral rear portion 15' of triangular form for feeding the cut strip to and through the folder l4 and to the stitching machine.

The forward portion of the front top feed-dog 15 feeds the fabric to and through movable shear blades H, Ti held in carriers T8, 73. The movable blade carriers are slidably mounted on a rock shaft [9. As shown by dotted lines in parts 18 and 18, Figure 3, the carriers '18, 18 are slidably mounted on the shaft 19 by a key and are resiliently pressed by coil springs 8! in the direction of the stationary shear blades 87.

The springs 8| react against collars 82 fixedly mounted on the shaft 79. The stationary shear blades 81 are held in properly spaced cutting relation by being held in a blade carrier 83 of the desired width. The movable shear blades 71, 7'! thus cooperate with the stationary shear blades 8'! to cut a fabric strip of predetermined width.

The movable shear blades Tl, Tl" are given substantially vertical movements by the carriers 18, 18'. The carriers slidably engage the elon- The key is held in fixed parallel relation with the rock shaft 79 by being held in an arm 84 fixed to the shaft. An arm 85 is fixed to one end of the shaft 18, and is pivotally connected to a vibrating connection 86 operated by an eccentric 88 on the main shaft ll. As the main shaft I1 rotates, the rock shaft 19 actuates the movable shear blades l1, 77' once for each revolution of the main shaft.

As shown in Figures 3 and. 4, the belt loop forming mechanism comprises an intermediate top feed-dog 16 which serves for feeding the folded strip of fabric through the passageway between the side bars H, 12 in the work clamp 68 and to the ridge forming element or oscil latory finger 5|. The feed-dog 16 is secured by a screw 93 at one end of an extension feed bracket 94. The extension feed bracket 94 is secured to a sewing machine feed-bar 95 which is given four-motion feeding movements through a mechanism (not shown) but which is well known in the art.

The front top feed-dog T5 for feeding the scrap or strip fabric between the movable shear blades 11, 11', is pivotally mounted on a screw lili passing through the forward portion I92 of the fee bracket 94. The front top feed dog ?5 is secured to a carrier ma which is pivotally mounted on the screw lfil in the forward portion I92 of the extension feed bracket 94. A coil spring I03 is mounted on the screw IOI and is secured at --cutti.ng edges.

2.5 .ionezendlagainstrai hub I64 :of'c the i-feedazbracket 94 and is in1tensicned:engagementaat: the: other end1against arscrew: I'E35;inr.the :carrier: I Bil. I'Ihe coil spring: H33: serves topressithe: frontotop: reed- -;dog 15 against the upper t surface :rof v: the ahlade :carrier: 83 for the :stationary blades 2:81, :and in :pressure contact zwith: thezwork. The npperssurface of the :lrlade: carriera-83 sis at'ithe' level. of *a :raised front extension-ror-zbelt-loopz'workasnpport I! in front of the work? supportj3fi.

The front top feedz-dog I5 :hasi feeding teeth extending transversely: across the [entire --lower 1 surface thereof. direction as the-teeth on the intermediate wtop .feededog'ie, andin the :same directionra "the teeth on therear top-feed-dogasfi, Figurevii.

-Asibest shown in Figure3,.'it will -berseen that the fronttop'feed-dog '15 is considerablywwider than. the intermediate ton feeddog-1$. .iInprac- -tice, theiront feed-dog 7-5 feeds strip fabric-cut .to the: size of a blank-melt-1oop;while the nintermediate feed-dog "i5 feeds fabric folded in :helt

100p form.

The intermediate top: feed-dog ifircomprisesra rectangular front portion: 86' and a: reducedrear I portion 9! of "a size-smallyenoughto operate in a slot 92 in the presser-finger-zez.

Asshown in "Figure 4, it willv be s-sen that the movable blades TI have' substantially horizontal :These blades are given derm- =wardi cutting movements against the work. :It will be seen that when the top feededog =-is'- efeeding, it presses 'on the-work, 'whi le'the mova blades are clear of the work. worked upon is contacted successivelyn i feed-dog oriby themovable blades.

. In tiny prior "patent, I :thave ."disclosed-sa folder :having a tongue about which the 'cntabeltftloop "strip :has its :side redgesftelded underneath :the strip.

In the disclosure .herewith, ithe :fol'der 7 4 :is :without 'anytongue. :ASI ShOWIl iIL' Figure the folder turned 'side edge portions 1138, "I539. The "far end of the "edgez'por'tion? idstisrpositioned "and in overlapping relation withtthecfarfiend *t-heedge' portion Ifitfthat isat'itheioutleteenii IIO,:Figure l.

Theifolder '74 has a triangular passageway i! I 'which causes an ioverlapping ofthe edges that various-changes and modifications can be made therein without departing from the spirit of the invention as defined by the appended claims.

I "claim:

1. In a mechanism for simultaneously trimming both edges of a 'fabi io str-i-p and top feedi;

and-finishing belt loops. having flat and *superf posed edge portions in aesing-le operation, :the combination with a sewing .rmachine ihavi-ng a work supporting base, a head, a presser foot These :teeth face the 2' same 54 *comprises :upwardiy 'i and :inwardly.

'6 esupportedzibyg saidv headcand; a: curvedmeedleaand means;for.forming:blindstitchzstitching; anrarm reciprocally: mounted: :in Esaid headeands having a four-motion: feeding :tmovement rand 'icarrsdng f a 5 .Jfeededoginthe rear of said-needle;frontsand intermediate top rfeededogs ;,placed behind the: other and vlacing:fixedztoszsaidsrear fee'd-edog I carrying: arm I and ijbeing. zmonntedf for four-tenortion. feedingxmovementsainZirontoizsaidineed'le, 1o tmeans :for "pivotally .mounting :and :resil-iently :d-ownpressing :said .front top ifee'd zdog, :recipro- :catory ishear :b'lades .fmonnte'd on a sshaft 'rposi- :tioned =sbelow said work :supporting chase, fsaid xthlades rbeing: respectively:zpositioned:"oiriopposite i sides "of isaidr forward stop feed=dogr for :cutting E'flIStiiDTOf fabric:ofi:predeterminedi width, acwork qclamp ibe'lowiisaidrpresser f0Ot5h82Vi1l'g JW0 rigid rside'rbars'formingzazfixed guidewayzcentraliytand lengthwise x'thereof, 2a folder for Yielding iooth lsideiedgesiof saidsshear ed istrip "of f tabrici above said strip. into i: superposed relation, rsai'd folder having 5 a iconverging passage in its 'oppermall, said "reciprocatory :shear rblades ."coacting 'itvith stationary 'bla'des secured to opposite faces oi a stationary blade "carrier 'ihaving :af'flat upper sufface, "said "front top feed-d-og 'bein'g' pivota'ily "mounted on a piVOtparr-ied by -sai'd i reciprocat- "ing 1 arm, -said "intermediate top Zfeed 'd'og being 'mounted in"th-e rear of said foIder "passage -for 30 fee'ding the "folded "fabric thre'ugh -said f-older and directlytosaid needle.

"2.In a mechanism for simultaneously ti'imming both edges of a fabi'ic strip arid top feeding c u "and 7 finishing belt 1oops"having flat arfd snperposed edge portions'in a'single operation,the combination with a sewing machine "having 1 a work 'suppoi'tin'gpase, 'a head, a pressef'foot "supportedby said head and a curved needle and "meansforforming 'blind'stitch stitching, 'an' arm reciprocally mounte'din said head 'an'd having "afour'motionfeeding movement, said'arm'carry- 'ing a top 'fee'd-dog'in'the rear or said"needle, "front *andintermediate topieed-dogs placed one behind the other and being fixed to said rear "deed-dog carrying arm and being mounted for "four motion feeding movements in"front-'of said "needle, "means for 'pivotally mounting and resilientl-y downpressing said "front top "'feed dog, r reciprocatoryshear' blades mourited'on a shaft positioned'below said work supporting base,'s'aid blades being respectively positioned on opposite 'sides'of said forwar'd top feed-dog 'for cutting "a sti'ip'of fabric er predetermined widthyafolder for fol'ding both side edges of said 'sheareds'trip or ie-brie ---above said strip into superposed *rela- 1 tion, saiddolder having a converging angiilai ly "directed passage" in its upper wall, "a work clamp below *said presser foot having two rigid side bars forming a' guideway centrally an'dlengthwise "thereof 'for guiding folded belt loops, "said "reciprocatory shear blades coacting with "stationary blades secured to opposite "faces of a stationary blade "carrier havinga' fiatupper-flsurface, said front top feed-dog being pivotal'ly imountedl'on a pivot I carried 'by: said rfreeip'rocat- :ings arm; in front :of said intermediate topifeedsdog, -said :Eintermediat-e itop feededog being "mounted in therrearwofsaid foldergpassageior .feeding the :folded .ffabric through "said :ufolder ea ndedirectly to: said: needle.

3..- In ra mechanism .for simultaneously trimnming both edges of a fabric strip and: top. feeding and flnishingebelt loops having .flat vfilld S'LlPGY- ;.posed edge portions in ca esingle operation, the

combination with a sewing machine having a work supporting base, a head, a presser foot supported by said head and a curved needle and "means for forming blindstitch stitching, an arm reciprocally mounted in said head above said work supporting base and having a four-motion feeding movement, said arm carrying a top feeddog in the rear of said needle, front and intermediate top feed-dogs placed one behind the other and being fixed to said arm and being mounted for four-motion feeding movements in front of said needle, means for pivotally mounting and resiliently downpressing said front top feed-dog, reciprocatory shear blades mounted on a shaft positioned below said work supporting base, said blades being respectively positioned on opposite sides of said forward top feed-dog for cutting a strip of fabric to a predetermined width, a folder for folding both side edges of said sheared strip of fabric above said strip into superposed relation, said folder having a rearwardly converging passage in its upper wall, a work clamp below said presser foot having two rigid side bars forming a guideway centrally and lengthwise thereof for guiding folded belt loops, said reciprocatory shear blades coacting with stationary blades secured to opposite faces of a stationary blade carrier having a fiat upper surface, said front top feed-dog being pivotally mounted on said reciprocating arm in front of said intermediate top feed-dog, said intermediate top feed-dog being mounted in the rear of said folder passage for feeding the folded fabric through said folder and directly to said needle.

4. In a mechanism for simultaneously trim- Y ming both edges of a fabric strip and top feeding and finishing belt loops having fiat and superposed edge portions in a single operation, the combination with a sewing machine having a work supporting base, a head, a presser foot supported by said head and a curved needle and -means for forming blindstitch stitching, a feed arm reciprocally mounted in said head above said work supporting base and having a fourmotion feeding movement, said arm carrying a top feed-dog in the rear of said needle, front and intermediate top feed-dogs placed one behind the other and being fixed to said arm and being mounted for four-motion feeding movements in front of said needle, means for pivotally mounting and resiliently downpressing said front top feed-dog, reciprocatory shear blades mounted on a shaft positioned below said work supporting base, said blades being respectively positioned on opposite sides of said forward top feed-dog for cutting a strip of fabric to a predetermined width, a folder for folding both side edges ofsaid sheared strip of fabric above said stripand into superposed relation, said folder having a rearwardly converging passage, a work clamp below said presser foot having two rigid side bars forming a guideway therebetween and centrally and lengthwise thereof for guiding folded belt loops, said reciprocatory shear blades coacting with stationary blades secured to opposite faces of a stationary blade carrier having a fiat'upper surface, said front top feed-dog being pivotally mounted on said reciprocating arm in front of said inter- "mediate top feed-dog, said front top feed-dog having a rectangular front portion for feeding flat strip fabric between said shear blades and having a triangular rear portion for feeding the fabric through said folder, said intermediate top feed-dog being mounted in the rear of said folder passage for feeding the folded fabric through said folder and directly tosaid needle.

5. In a mechanism for trimming both edges of a fabric strip and finishing blindstitched belt loops having superposed edge portions, the combination with a sewing machine having a work supporting base, a head, a presser foot supported by said head, a curved needle and means for forming blindstitch stitching, a feed arm recipz rocally mounted in said head above said work supporting base and having a four-motion feeding movement, said arm carrying a top feed-do in the rear of said needle, top feed-dog means fixed to said arm and mounted for four-motion feeding movements in front of said needle, stationary and reciprocatory shear blades respectively positioned to cut a section of fabric to a predetermined width, a triangularly shaped folder having curved side edges for folding the side edges of said strip of fabric into superposed relation, said folder having a rearwardly converging passage, a work clamp below said resser foot, said front top feed-dog means having a rectangular front portion for feeding flat strip fabric between said shear blades and having a triangular rear portion for feeding the fabric through said folder.

-6. In a mechanism for trimming both edges of a fabric strip and finishing blindstitched belt loops, the combination with a sewing machine having a pivoted work supporting base, a head, a presser foot supported by said head, a curved needle and means for forming blindstitch stitching, a feed arm reciprocally mounted in said head above said Work supporting base and having a four-motion feeding movement, said arm carrying a top feed-dog in the rear of said needle, top feed-dog means fixed to said arm and mounted for four-motion feeding movements in front of said needle, stationary and reciprocatory shear blades respectively positioned to cut a section of fabric to a predetermined width, 3, triangularly shaped folder having curved side edges for folding the side edges of said out strip of fabric into superposed relation, said folder having a rearw-ardly converging passage, a work clamp below said presser foot, a stationary blade carrier, said reciprocatory shear blades coacting with stationary blades secured to opposite faces of said 'stationary blade carrier, said front top feed-dog means having a rectangular front portion for feeding fiat strip fabric between said shear blades and having a triangular rear portion for feeding the fabric through said folder.

'7. In a blindstitch belt loop sewing machin having a curved needle and a feed arm and a feed-dog carried thereby for four-motion feeding movements in the rear of said needle, a work support in front of said needle, a top feed means attachableto said feed arm and including a front top feed-dog positioned in front of said needle, and means for resiliently downpressing said front top feed dog against said work support, for four motion feeding movements thereon.

JOSEPH GALKIN.

REFERENCES CITED v The following references are of record in the 

